BITSAT2014ChemistryThermodynamics (C)Actual
If the enthalpy of vaporization of water is 186.5 kJmol ⁻¹ , the entropy if its vaporization will be:
Options
- A0.5 kJK ⁻¹ ~mol ⁻¹
- B1.0 kJK ⁻¹ ~mol ⁻¹
- C1.5 kJK ⁻¹ ~mol ⁻¹
- D2.0 kJK ⁻¹ ~mol ⁻¹
Correct answer
A. 0.5 kJK ⁻¹ ~mol ⁻¹
Step-by-step solution
Given enthalpy of vaporization, H =186.5 ~kJ ~mol ⁻¹ Boiling point of water =100^ C =100+273=373 ~K Entropy change, array r S = H T = 186.5 ~kJ ~mol ⁻¹ 373 ~K =0.5 ~kJ ~mol ⁻¹ ~K ⁻¹ array